chrome/common/safe_browsing/zip_analyzer.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/common/safe_browsing/zip_analyzer.h"
   6
   7 #include "base/logging.h"
   8 #include "chrome/common/safe_browsing/download_protection_util.h"
   9 #include "third_party/zlib/google/zip_reader.h"
  10
  11 namespace safe_browsing {
  12 namespace zip_analyzer {
  13
  14 void AnalyzeZipFile(base::File zip_file, Results* results) {
  15   zip::ZipReader reader;
  16   // OpenFromPlatformFile may close the handle even when it fails, but there is
  17   // no way to know if it did that or not. Assume it did (that's the common
  18   // case).
  19   if (!reader.OpenFromPlatformFile(zip_file.TakePlatformFile())) {
  20     VLOG(1) << "Failed to open zip file";
  21     return;
  22   }
  23
  24   bool advanced = true;
  25   for (; reader.HasMore(); advanced = reader.AdvanceToNextEntry()) {
  26     if (!advanced) {
  27       VLOG(1) << "Could not advance to next entry, aborting zip scan.";
  28       return;
  29     }
  30     if (!reader.OpenCurrentEntryInZip()) {
  31       VLOG(1) << "Failed to open current entry in zip file";
  32       continue;
  33     }
  34     const base::FilePath& file = reader.current_entry_info()->file_path();
  35     if (download_protection_util::IsBinaryFile(file)) {
  36       // Don't consider an archived archive to be executable, but record
  37       // a histogram.
  38       if (download_protection_util::IsArchiveFile(file)) {
  39         results->has_archive = true;
  40       } else {
  41         VLOG(2) << "Downloaded a zipped executable: " << file.value();
  42         results->has_executable = true;
  43         break;
  44       }
  45     } else {
  46       VLOG(3) << "Ignoring non-binary file: " << file.value();
  47     }
  48   }
  49   results->success = true;
  50 }
  51
  52 }  // namespace zip_analyzer
  53 }  // namespace safe_browsing